Analysis of the local current in GdBCO coated conductors using low-temperature scanning laser and Hall probe microscopy

The distribution of the local current in GdBCO coated conductors was investigated using low-temperature scanning laser and Hall probe microscopy (LTSLHPM). We prepared GdBCO coated conductors to study the spatial distribution of the current density in a single bridge. Inhomogeneity in the bridge was analyzed using the experimental results of scanning laser microscopy near the superconducting transition. The local transport and screening currents in the bridge were also obtained by scanning Hall probe microscopy. From the experimental results of scanning laser and Hall probe microscopy, we have observed redistribution of the current caused by defects of the coated conductors.

► The local superconducting properties in GdBCO sample were analyzed by LTSLHPM.
► We identified relationship between voltage response and the critical temperature.
► The highest response δV was observed in the vicinity of the transverse defect.
► The redistribution of the current was observed around the defect from SHPM.
► The origin of inhomogeneous voltage response was directly confirmed by LTSLHPM.